Help:

ViewVC Help: Query The Commit Database

Select your parameters for querying the CVS commit database in the
form at the top of the page. You
can search for multiple matches by typing a comma-seperated list
into the text fields. Regular expressions, and wildcards are also
supported. Blank text input fields are treated as wildcards.

Any of the text entry fields can take a comma-seperated list of
search arguments. For example, to search for all commits from
authors jpaint and gstein, just type: jpaint,
gstein in the Author input box. If you are searching
for items containing spaces or quotes, you will need to quote your
request. For example, the same search above with quotes is:
"jpaint", "gstein".

Wildcard and regular expression searches are entered in a similar
way to the quoted requests. You must quote any wildcard or
regular expression request, and a command character preceeds the
first quote. The command character l(lowercase L) is for wildcard
searches, and the wildcard character is a percent (%). The
command character for regular expressions is r, and is
passed directly to MySQL, so you'll need to refer to the MySQL
manual for the exact regex syntax. It is very similar to Perl. A
wildard search for all files with a .py extention is:
l"%.py" in the File input box. The same search done
with a regular expression is: r".*\.py".

All search types can be mixed, as long as they are seperated by
commas.